You know, I sometimes worry that my mental map of London’s property prices might be a bit simplistic. Okay, I know Bloomsbury, say, is more expensive than Barking. But which is better value? Where are you getting more for your money?

Well – enquiring minds need worry no longer, because housing analyst Neal Hudson, who used to work at Savills before he went rogue*, has just published this rather lovely map. It shows property prices per square foot in every London postcode: not the area ones, like N1 or E17, but the individual locations.

And it demonstrates, among other things, that, measured purely on the basis of size, homes in Barking are much better value than those in Bloomsbury. So as long as you’re not worried about location or facilities or that sort of thing, Barking is definitely better.

The map only shows postcodes inside Greater London (which, oddly, means that some homes in London E4, which are technically in Essex, aren’t included). As a result, you can see exactly how arbitrary the city boundaries are in a few places:

On this version I’ve labelled some of the contiguous suburbs that fall outside the city boundaries.

You can also see the surprisingly big areas of the city that done include any homes. In the centre, this is because of parks, or the offices of the City; but further out there’s a surprisng amount of industrial land (in the dark greys that mean “built up”) or open space (in the light grey that mean, well, not).

As to the prices themselves – as you’d expect, they’re highest in the centre. But the most expensive areas, in burning hot whites and yellows, also spread to the west into Kensington and Chelsea, and north into Hampstead.

The cheapest, meanwhile, are generally to be found to by the Thames to the east, especially in the boroughs of Barking and Bexley. In fact, the map shows at a glance many of the prejudices that have been built into London’s social geography for decades. North is more expensive than south; west more than east.

Probably the single most striking thing about the map is the way it highlights the way the character of the river changes as you travel across London. In the West, where the Thames is narrow, pretty and easily crossed, the most expensive properties are those by the river. In the east, where it’s wide, industrial and unbridged, it’s the cheapest.

The unadulterated version. Image: Getty.

Anyway, there’s no doubt loads more interesting stuff to find in here, if you’re minded to spend an hour looking (not least, the relative price in your own area). So why not play with the big version of the map on Hudson’s own website. You can also follow him on Twitter, and should, because he posts lovely maps like this surprisingly often.

A couple of weeks ago, someone on Twitter asked CityMetric’s editor about the longest possible UK train journey where the stations are all in progressive alphabetical order. Various people made suggestions, but I was intrigued as to what that definitive answer was. Helpfully, National Rail provides a 3,717 page document containing every single timetable in the country, so I got reading!

(Well, actually I let my computer read the raw data in a file provided by ATOC, the Association of Train Operating Companies. Apparently this ‘requires a good level of computer skills’, so I guess I can put that on my CV now.)

Here’s what I learned:

1) The record for stops in progressive alphabetical order within a single journey is: 10

The winner is the weekday 7.42am Arriva Trains Wales service from Bridgend to Aberdare, which stops at the following stations in sequence:

The second longest sequence possible – 8 – overlaps with this. It’s the 22:46pm from Cardiff Central to Treherbert, although at present it’s only scheduled to run from 9-12 April, so you’d better book now to avoid the rush.

Not quite sure what you’ll actually be able to do when you get to Trehafod at half eleven. Maybe the Welsh Mining Experience at Rhondda Heritage Park could arrange a special late night event to celebrate.

There is a chance for a bit of CONTROVERSY with the last one, as you could argue that the final station is actually called London St Pancras. But St Pancras International the ATOC data calls it, so if you disagree you should ring them up and shout very loudly about it, I bet they love it when stuff like that happens.

Alphabetical train journeys not exciting enough for you?

2) The longest sequence of stations with alliterative names: 5

There are two ways to do this:

Ladywell, Lewisham, London Bridge, London Waterloo (East), London Charing Cross – a sequence which is the end/beginning of a couple of routes in South East London.

4) The greatest number of stations you can stop at without changing trains: 50

On a veeeeery slow service that calls at every stop between Crewe and Cardiff Central over the course of 6hr20. Faster, albeit less comprehensive, trains are available.

But if you’re looking for a really long journey, that’s got nothing on:

5) The longest journey you can take on a single National Rail service: 13 hours and 58 minutes.

A sleeper service that leaves Inverness at 7.17pm, and arrives at London Euston at 9.15am the next morning. Curiously, the ATOC data appears to claim that it stops at Wembley European Freight Operations Centre, though sadly the National Rail website makes no mention of this once in a lifetime opportunity.

6) The shortest journey you can take on a National Rail service without getting off en route: 2 minutes.

Starting at Wrexham Central, and taking you all the way to Wrexham General, this service is in place for a few days in the last week of March.

7) The shortest complete journey as the crow flies: 0 miles

Because the origin station is the same as the terminating station, i.e. the journey is on a loop.

8) The longest unbroken journey as the crow flies: 505 miles

Taking you all the way from Aberdeen to Penzance – although opportunities to make it have become rarer. The only direct service in the current timetable departs at 8.20am on Saturday 24 March. It stops at 46 stations and takes 13 hours 20 minutes. Thankfully, a trolley service is available.

9) The shortest station names on the network have just 3 letters

Ash, Ayr, Ely, Lee, Lye, Ore, Par, Rye, Wem, and Wye.

There’s also I.B.M., serving an industrial site formerly owned by the tech firm, but the ATOC data includes those full stops so it's not quite as short. Compute that, Deep Blue, you chess twat.

10) The longest station name has 33 letters excluding spaces

Okay, I cheated on this and Googled it – the ATOC data only has space for 26 characters. But for completeness’ sake: it’s Rhoose Cardiff International Airport, with 33 letters.

No, I’m not counting that other, more infamous Welsh one, because it’s listed in the database as Llanfairpwll, which is what it is actually called.

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